You could go ahead and use the T42 template, but it is a 45 degree angle, so if you cut a 2–5/8” x 2-5/8” square, then cut diagonally 2 times, you will get four 45 degree triangles. Cut a second 2-5/8” square and you have eight triangles for the center of the block.

With all the points in this block, pressing is super important. Just remember to press the seams of T45/T44/T43/T42 to the left. Press T45 Rev/T44/T 43 Rev/T42 to the right and all should be well.